/******************************************************************************
 * Copyright (C) 2014 ShenZhen YiHua Computer Co., Ltd.
 * All Rights Reserved.
 * 本软件为深圳怡化电脑股份有限公司开发研制。未经本公司正式书面同意，其他任何个人、团体
 * 不得使用、复制、修改或发布本软件.
 *****************************************************************************/
package net.dgg.dggcloud.core.util;
import java.nio.charset.Charset;


/**
 * Byte工具类
 * @author  余松
 * @date    2014年3月24日
 * @version v1.0
 */
public class ByteUtil {
	public static byte[] getBytes(short data) {
		byte[] bytes = new byte[2];
		bytes[0] = (byte) (data & 0xff);
		bytes[1] = (byte) ((data & 0xff00) >> 8);
		return bytes;
	}

	public static byte[] getBytes(char data) {
		byte[] bytes = new byte[2];
		bytes[0] = (byte) (data);
		bytes[1] = (byte) (data >> 8);
		return bytes;
	}

	public static byte[] getBytes(int data) {
		byte[] bytes = new byte[4];
		bytes[0] = (byte) (data & 0xff);
		bytes[1] = (byte) ((data & 0xff00) >> 8);
		bytes[2] = (byte) ((data & 0xff0000) >> 16);
		bytes[3] = (byte) ((data & 0xff000000) >> 24);
		return bytes;
	}

	public static byte[] getBytes(long data) {
		byte[] bytes = new byte[8];
		bytes[0] = (byte) (data & 0xff);
		bytes[1] = (byte) ((data >> 8) & 0xff);
		bytes[2] = (byte) ((data >> 16) & 0xff);
		bytes[3] = (byte) ((data >> 24) & 0xff);
		bytes[4] = (byte) ((data >> 32) & 0xff);
		bytes[5] = (byte) ((data >> 40) & 0xff);
		bytes[6] = (byte) ((data >> 48) & 0xff);
		bytes[7] = (byte) ((data >> 56) & 0xff);
		return bytes;
	}

	public static byte[] getBytes(float data) {
		int intBits = Float.floatToIntBits(data);
		return getBytes(intBits);
	}

	public static byte[] getBytes(double data) {
		long intBits = Double.doubleToLongBits(data);
		return getBytes(intBits);
	}

	public static byte[] getBytes(String data, String charsetName) {
		Charset charset = Charset.forName(charsetName);
		return data.getBytes(charset);
	}

	public static byte[] getBytes(String data) {
		return getBytes(data, "GBK");
	}

	public static short getShort(byte[] bytes) {
		return (short) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
	}

	public static char getChar(byte[] bytes) {
		return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
	}

	public static int getInt(byte[] bytes) {
		return (0xff & bytes[0]) | (0xff00 & (bytes[1] << 8))
				| (0xff0000 & (bytes[2] << 16))
				| (0xff000000 & (bytes[3] << 24));
	}

	public static long getLong(byte[] bytes) {
		return (0xffL & (long) bytes[0]) | (0xff00L & ((long) bytes[1] << 8))
				| (0xff0000L & ((long) bytes[2] << 16))
				| (0xff000000L & ((long) bytes[3] << 24))
				| (0xff00000000L & ((long) bytes[4] << 32))
				| (0xff0000000000L & ((long) bytes[5] << 40))
				| (0xff000000000000L & ((long) bytes[6] << 48))
				| (0xff00000000000000L & ((long) bytes[7] << 56));
	}

	public static float getFloat(byte[] bytes) {
		return Float.intBitsToFloat(getInt(bytes));
	}

	public static double getDouble(byte[] bytes) {
		long l = getLong(bytes);
		return Double.longBitsToDouble(l);
	}

	public static String getString(byte[] bytes, String charsetName) {
		return new String(bytes, Charset.forName(charsetName));
	}

	public static String getString(byte[] bytes) {
		return getString(bytes, "GBK");
	}

	public static void main(String[] args) {
		
		short s = 122;
		int i = 122;
		long l = 1222222;

		char c = 'a';

		float f = 10000000000f;
		double d = 122.22;

		String string = "我是好人";
		System.out.println(s);
		System.out.println(i);
		System.out.println(l);
		System.out.println(c);
		System.out.println(f);
		System.out.println(d);
		System.out.println(string);

		System.out.println("**************");
		System.out.println(getShort(getBytes(s)));
		System.out.println(getInt(getBytes(i)));
		System.out.println(getLong(getBytes(l)));
		System.out.println(getChar(getBytes(c)));
		System.out.println(getFloat(getBytes(f)));
		System.out.println(getDouble(getBytes(d)));
		System.out.println(getString(getBytes(string)));
	}
}
